Chusetts



Juhe 16, '1925. 1,542,586

D. N. RUB IN ET AL AUTOMATIC PORTABLE NAILING MACHINE Filed Oct 25, 1922 3 Sheets-Sheet 1 2-7 25 as so 5| ,0 42

' June 1 1925. 1,542,586

' D. N. RUBIN ET AL AUTOMATIC PORTABLE NAILING MACHINE Filed Oct. 25, 1922' i 3 Sheets-Sheet 2 sgkvais;

I lnveiztons; I Y vwmm-wQ Mwfiw I June 16, 1925.

D. N. RUBIN ET AL AUTOMATIC PORTABLE NAI LIING MACHINE Fild Oct. 25, 1922 3 Sheets-Sheet 5 1 "All!!!" Patented June 16, 1925.

DAViD N. RUBIN, or wm'rnnor,

, 1,542,586 PATENT OFFICE.

AND BENJAMIN suarm or nos'ron, MASSA- CHUSETTS.

AUTOMATIC PORTABLE NAILING MACHINE.

Application filed October 25, 1922.. Serial No. 596,777.

To all whom it may cancer-n:

Be it known that-we, DAVID BENJAMIN SHAPmo, citizens of the United States, residing at \Vinthrop and Boston, re-

spectively, both in the county of Suffolk and State of Massachusetts, have invented a certain new and useful Improvement in Automatic Portable Nailing Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to nailing or tacking machines and has for its object to pro-v vide an efiicient power driven machine which is nevertheless portable so as to be capable of use for driving carpet, upholstery, or

other tacks, small nails, or similar fasten' ers (hereinafter referred to generally as tacks) in substantially any position or di-' rection, said machine being of the magazine type and having means for efiectively and reliably feeding the tacks fromthe magazine or hopper to the driver notwithstanding the position or angle in which the machine is held, and for holding said tacks for the action of the driver and releasing the same when driven.

The more particular objects of the invention, together with means whereby the same may be carried into effect, will best be understood from the following description of one form or embodiment thereof illustrated in the accompanying drawings. It will be understood, however, that the particular construction and arrangement of parts herein shown and described have been chosen for illustrative purposes merely, and that the invention, as defined by the claims hereunto appended, may be otherwise practiced withoutdeparture from. its spirit and scope.

In said drawings:

Fig. 1 is a substantially central longitudinal section of the complete machine.

Figs; 2 and 3 are transverse sections of the hopper takensubstantially on the lines 2-2 and 3-3, Fig. 1.

Fig. 4 is a detail elevation of the driver, illustrating the cooperation therewith of the jaws for holding the tacks in position to be driven.

Fig. 5 is a detail plan view of the holding jaws, the position of the driver being indi-f" cated in dotted lines,

Fig. 6 is a detail cross section, takensub- N RUBIN and stantially on the line 66 of Fig. l of the portion of the casing constituting the tack raceway.

Fig. 7 is a detail view of the motor cylinder and the driver operated thereby, showing the spring for retracting said driver.

Fig. 8 is a fragmentary section, taken substantially on the line 88 of Fig. 1, of the bottom of the hopper, showing the entrance to the raceway and detent therein.

Fig. 9 is a detail section, taken substantially on the line 9-9, Fig. 1', of the means for opening the tack holding jaws.

Fig. 10 is a fragmentary view of the lever for operating the hopper gate. 7

Fig. 11 is a fragmentary elevation of a portion of the hopper.

Fig. 12 is an enlarged detail section of thecontrolling valve and associated parts.

The machine as a whole is enclosed by a casing A to which is secured, as by screws 2, a hollow head block 1, said casing having a suitable handle 4 whereby the machine may be manipulated. The head block 1" is whereby the pressure chamber 41 in said head block may be suppliedwith compressed air. Said head block at its opposite side has threaded therein a stem 42 forming a part of a cylinder 13 containing a piston D carried by a piston rod 12 theouter end of which constitutes the driver. The motor comprising the cylinder 13 and piston D is of the single acting type, said cylinder being open at its outer end and communieating at its inner end, through passages 50 and 50 in the head of said cylinder and in the stem 42, with the pressure chamber 41 in the head block 1, the effective size of the passage '50 3 in the form of a screw in threaded en gagement with an opening in said stem communicating with said passage. The passages 50 and 50 are slightly ofiset from one another, and the passage afforded therethrough iscontrolled by a piston valve E arranged to slide longitudinally in a transverse passage 48 intersecting the passages 50 and 50 at. their junction.- The valve E is normally held in the position shown in being regulated 'by valve may be completely disassembled,

between the exterior of the cylinder 13 and a head F on said valve, the position of the valve under the influence of the spring 46 bein determined by engagement of a head 37 thereon with an exterior recess in the opposite side of the cylinder. The valve E comprises two piston portions E and E connected by a stem G. The piston portion E is adapted, when the valve is in its normal position 'under the influence of the spring 46, to cut off the supply of air through the passage but, due to the offset disposition of the passage 50 leading to the cylinder, the latter passage is not fully closed but is left in communication with the passage 48 which, in turn, communicates with the atmosphere through a passage 49 whose effective area is regulated by an adjusting screw 56. Imngitudinal movement of the valve E against the tension of the spring 46 causes the piston portion E to close the passage 49. and at. the same time causes the piston portion E to open communication between the pa sage 50 and 5") and admit air to the ylinder. Said valve is-operated for the lath-r purpose by means of a trigger or fiugerpievc 5 pivoted in a recess in the handle 4. The

driver is retracted, when the finger-pie e 5 is released and the valve E returned to normal position, by means of a spring 4-7 (Fig. 7 connecting a pin 44 on said driver with a pin H projecting from the exterior of the cylinder 13, the air in the inner end of said cylinder at this time escaping through the passages 50, 48 and 49 to the atmosphere. I

The tacks to be driven are supplied from a magazine or hopper secured to the casing A in a position inclined to the path of move- 'ment of the driver'so as to facilitate the feeding of tacks from said hopper in all positions of the machine between the vertical and the horizontal. Said hopper comprises substantially coaxial cylindrical sections 38 and 26, between which is interposed a section 25 (Figs. 1 and 11) of glass or other transparent material, the section 38 being secured to the casing A, as by screws W (Fig. 2) and projecting thereinto through an opening therein, and the several sections being" held in assembledrelationship by means of bolts J connecting lugs K on the sections 26 and 38. By merely removing the bolts J the hopper if desired,

in order to clear the. propelling disk hereinafter referred to in case the latter should inadvertently become jammed, as by the presence of a. defective tack. The Section 26 constitutes a receiving; chamber which is normally separated from the delivery chamber, formed by the sections 25 and 38, by means of a gate .31 comprising a disk substantially fitting the reduced innner end of being normally seated by a spring 30. The

inner end of the stem 29 is engaged by a lever 6 (Figs. 1 and 10) pivoted to the cylinder 13 and has its end extended, in the form of a tingerpiece, through the casing A into a convenient position adjacent the handle 4. The outer side ori'end of the receiving chamber 26 is normally closed by a removable cover 'L'which is secured in place by a sliding bolt 28 having an operating knob 27 Thetacks to be driven are supplied to the receiving chamber in the upper or outer section 26 of the hopper which is filled with said tacks, the latter being admitted a few at a time to the deli very chamber of said hopper by manipulation of thelever, the number of tacks at any time in the" latter chamber being readily By this arrangement a considerable supply of tacks can be carried in the hopper, said tacks being, however, supplied a few at a time to the means for feeding the same from the hopper, thereby avoiding clogging of said feeding means. 1

The bottom of the section 38 of the hopper is formed with an annular groove'M (Figs. 1 and 2) extending substantially therearound, being provided at one point with a switch member 52 adapted to divert tacks passing about said groove through an outlet N in the hopper section communicating-with the tack raceway 39. The latter comprises a hollow rib (see Fig. 6) formed on the edge of the casing A so as to form a raceway which is closed at the outerside and open at the inner side, the raceway receiving theshanks of the tacks, the heads 23 of which are slidably engaged by a pair of flanges or gibs Psecured to the inner side of the casing adjacent the raceway. Retro grade movement of thetacks from the raceway 39 tothe hopper is prevented by a detent 54 (Figs. 1', 2, and 8) comprising a resilient pin or wire secured in place at the mouth of said raceway by a suitablescrew R. The tacks are forced out of the delivery chamber of the hopper, past the detent 53, and into the raceway 89 .by means of a propelling disk 24 having a hub rotatably mounted in the bottom of the hopper section 38, said disk, as shown most clearly in Fig-' carried by said slide. T

which diverts the same into the raceway and positively forces them past the detent 54. To this end the hub of the disk 24 is formed with a ratchet 51 which is engaged and actuated by a pawl 34 pivoted to the interior of the casing and operated by the head 37 of the valve E which carries a hooked pin a engaging a slot in said pawl, said ratchet 51 being held against retrograde movement by a holding-pawl 35. At each operation of the .valve E by the fingerpiece 5, the disk 24 is actuated at an amount sufiicient to force one tack from the hopper into the raceway, thereby maintaining thesupply of tacks in said raceway, as said tacks are used. The tacks in the raceway 39 are positively propelled along the latter by means of fingers 33 on a belt 21 which passes over rollers having journals 19 and 22 journalled in the walls of the casing A. For advancing the belt 21 an amount equal to the width of one tack at each operation of the driver, the shaft 19 has fast thereon a ratchet 20 which is held against retrograde movement by a holding-pawl 57 and is advanced by an operating pawl 17 pivoted to a pawl carrier 18 loosely hung on the shaft 19 and connected by a link 16 with a pin 15 projecting from the driver 12. In order to insure the maintenance of the last named connections, the driver is held against turning by means of a stud 43 projecting therefrom and guided in a longitudinal 'slot X (Fig. 7) in the cylinder 13.

The foregoing mechanism, it will be seen, operates positively to supply a tack to the driver at each operation of the latter, the tacks being positively fed from the hopper and being positively propelled along the raceway at a rate depending upon the rate of operation by the driver,'so that a supply of tacks to the latter is insured irrespective of the position or angle in which the device is held.

Each tack, after it is delivered from the raceway 39 to thedriving point, is caught by a pair of jaws 9 pivoted to a head 10 on a slide 8 and connected by a spring Z. The slide 8 is guided in a lug Y on the inside of the casing A for movement parallel to the path of movement of the driver and is normally held in retracted position by a spring 7 connected to the casin A and toa pin 11 l ie end of the driver 12 is recessed, as shown at S in Figure 4, to fit the heads of the tacks which are held in said recessed end by the jaws 9, the latter being pressed against the end of said driver by the spring 7 and having flanges T which,

normally embrace said .end, substantially enclosing the tack head and securely.retaining the same in the drivin position. The

forward movement of the river causes the I tack to be driven through the throat or nozzleV, and during this movement of the move with it until driver the jaws 9 and slide 8 move withsaid engaged by a wedge-shapedpin 53 carried by the casing. and thereby opened so as to release the tack head. Said jaws are spread apart sufiiciently to clear the end of .the driver 12, whereupon the spring. 7 retracts the slide 8, this movement being limited by the engagement of said jaws with pins 45 projecting from said driver. Thereafter, as the driver is retracted, said jaws and, slide their movement is arrested by engagement of. the head 10 on said slide with the lug Y, this occurring justbefore the driver reaches its fully retracted position, so that the jaws are assume a position adjacent the end of said driver and are closed by their spring Z.

It will be understood that the apparatus as a whole-may be moved from place to place, the flexible hoseB permitting such movement while maintaining the supply of motive fluid and that when it is desired to drive a tack the trigger 5 is operated, whereupon air is admitted to the cylinder 13, and the driver 12 is advanced to drive a tack throughthe' throat V. When the trigger 5 is released, the air cylinder, permitting the springs 47 tomtract sa1d driver and return it to normal is exhausted from said 1 again caused to position. The fingerpiece 6 is also manipu; 1

lated from time to time, as may seem necessary by observation of the tacks in the delivery chamber of the hopper through the transparent section 25, so as to renew the supply of tacks therein from the reserve stock in the receiving chamber 26, being thereupon-posltively fed from the hopper to the driver at a rate determined by the operation of the latter, so that the presence of a tack beneath the driver is always insured irrespective of the manner in which the machine is used and the position or angle in which it is held.

said tacks v If desired the mechanism for actuating made yielding so asto move idly over the ratchet 51 when the raceway is full.

Having thus described our invention, we claim:

1. Ina tacking machine, in combination,

into the raceway, in.

driving mechanism, operating-mechanism for said driving mechanism, controlling means for'said operating mechanism, a tack hopper, a tack raceway leading from sa1d hopper to sa1d driving mechanism, and means operated by said controlling means for forcing the tacks one by one from said hopper into said raceway. I

' 2. In a tacking machine, in combination, a driver, a fluid pressure motor for operating said driver, a valve'for controlling said motor, means for operating said valve, a tack hopper, a tack raceway leading from said hopper to said driver, and means operated by said valve operating means for forcing the tacks one by one from said hopper into said raceway.

3. A portable tacking machine comprising a driver, a fluid pressure motor for operating said driver, a manually operated valve for controlling said motor, a tack hopper, means operated by the operation of said valve for feeding tacks from said hopper, and means operated by said driver for feeding said tacks thereto.

4. In atacking machine, in combination, a driver, a fluid pressure motor for operating said,driver, a valve for controlling said motor, a tack hopper, a tack raceway conm'iunicating therewith, said hopper having in its bottom an annular groove terminating in a switch portion leading to said raceway, a disk in said hopper having notches communicating with said groove, a stem journalled in the bottom of said hopper and by which said disk is carried, a ratchet on said. stem, and a, pawl operated by said valve and cooperating with said ratchet.

5. In a portable tacking machine, a casing having a hollow rib constituting a tack raceway closed at the exterior of the casing and open at the interior thereof, and a pair of parallel flanges on the interior of the casing adjacent said raceway for slidably engaging the heads of the tacks in said raceway and retaining the same therein. i

In testimony whereof we aflix our signatures.

DAVID N. RUBIN. BENJAMIN SHAPIRO 

